Sometimes there's no way to be safe, e.g. aligning pumped lasers where you'd nee...

		eternauta3k on May 16, 2024 \| parent \| context \| favorite \| on: Femtosecond lasers create 3D midair plasma display... Sometimes there's no way to be safe, e.g. aligning pumped lasers where you'd need one set of glasses for the pump wavelength and another for the final wavelength.